Quinolinol ligands are aromatic heterocyclic compounds containing a quinoline ring and a hydroxyl group that provide coordination sites for metal ions. These ligands can form stable metal complexes with various metals, including aluminum, gallium, and zirconium, and are known for their luminescent properties. Quinolinol-based metal complexes are widely used in luminescent materials, including OLEDs and luminescent sensors, due to their high quantum yields and color tunability. They also have potential applications in catalysis, where they can stabilize metal ions in active catalytic species and increase reaction rates. In addition, quinolinol ligands are used to synthesize coordination polymers and functional materials with unique properties, such as magnetism and conductivity.